【摘 要】
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It is well known that the addition of metal ions (e.g.Fe, Cu, Mn) in the glass melt could produce different colorful glasses which can be used for decoration or houseware.It was found that the main fa
【机 构】
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Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education &International
【出 处】
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第七届中国功能玻璃学术研讨会暨新型光电子材料国际论坛
论文部分内容阅读
It is well known that the addition of metal ions (e.g.Fe, Cu, Mn) in the glass melt could produce different colorful glasses which can be used for decoration or houseware.It was found that the main factors which affect the color of the glasses are not only the species the transition metal oxide but also the amount of the addition and the atmosphere of the melting.All of these factors actually control the oxidation states of the transition metals, which play an important role in determining the color of the glasses.Various experimental methods have been employed to study the relationship between the glass color and the oxidation states of transition metals, among which the electron microscopy based technique, especially electron energy loss spectroscopy, have the advantage of combining high spatial resolution (sub-Angstrom) with high energy resolution (sub-eV) to obtain the microstructural and chemical information.In this study, three optical transparent Cu borosilicate glasses were synthesized by sol-gel method.The glasses show red, green and blue colors at sun light, respectively, and no precipitates could be optically observed.In order to elucidate whether the Cu exhibits different valence states in the nanoparticles, electron energy loss spectroscopy (EELS) combined with scanning transmission electron microscopy (STEM, Fig.1) were employed to quantify the Cu oxidation states in the glasses.By comparing the Cu L edge ELNES from the glasses with reference spectra (Cu, Cu2O and CuO in Fig.2), it is found that the precipitate in red glass is almost pure Cu metal, while in both green and blue glasses Cu exhibits mixed valence with different ratio of +1 and +2.In this talk, the evaluation of Cu oxidation states by EELS will be presented and the application of EELS in glass science will be discussed.
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